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  • Inorganic Chemistry  (3)
  • PACS: 78.66.-w Optical properties of surfaces and low-dimensional structures: superlattices, quantum well structures, and microparticles – 78.66.Jq Nanocrystalline semiconductors  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Light absorption in TiO2 nanoparticles (1999)
    Springer
    The European physical journal 9 (1999), S. 627-630 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 78.66.-w Optical properties of surfaces and low-dimensional structures: superlattices, quantum well structures, and microparticles – 78.66.Jq Nanocrystalline semiconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Light absorption in TiO2 nanoparticles is analyzed. The interface mechanism of light absorption, where the indirect interband electron transitions are caused by the possibility of the momentum nonconservation at the interface, is considered. This mechanism is found to be most important for crystallites, which are generally a few 10 nm or less in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050514
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  • 2
    Electronic Resource
    Electronic Resource
    Coexistence of two isomers in the crystal of 1,5-dihydro-1,5-dimethyl-3,3,7,7-tetraphenylcyclotetrasiloxane (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 524 (1985), S. 75-82 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Koexistenz von zwei Isomeren im Kristall des 1,5-Dihydro-1,5-dimethyl-3,3,7,7-tetraphenyl-cyclotetrasiloxansDie Kristall- und Molekularstruktur der Titelverbindung wurde bestimmt. Die gefundene ungeordnete Struktur kann als Ergebnis der Koexistenz von zwei Isomeren (cis und trans, jedes in zwei Konformationen) im Kristall angesehen werden.
    Notes: Crystal and molecular structure of the title compound has been determined. The structure disordering has been detected which can be considered as a result of coexistence of two isomers (cis and trans, each in two conformations) in the crystal.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855240510
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  • 3
    Electronic Resource
    Electronic Resource
    Structures of Two Cyclotetrasiloxanes with Intra and Intercyclic -CH2CH2-Bridges (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 533 (1986), S. 159-164 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Strukturen von zwei Cyclotetrasiloxanan mit intra- und intercyclischen  - CH2CH2-BrückenDie Molekularstrukturen von zwei Cyclotetrasiloxanen mit intra- und intercyclischen Ethylenbrücken wurden durch Röntgenstrukturanalyse bestimmt. Aufgrund der intracyclischen Brücke resultiert eine Sattel-Konformation, die für Tetrasiloxan-Ringe ungewöhnlich ist und eine deutliche Spannung des Ringes ergibt. Die Tetrasiloxan-Ringe, die durch diese Brücke verbunden sind, haben eine hochsymmetrische Sessel-Konformation, die wahrscheinlich in dem entsprechenden Polymer bestehen bleibt.
    Notes: Molecular structures of two cyclotetrasiloxanes with intra and intercyclic ethylene bridges were determined by an X-ray structure analysis. The presence of the intracyclic bridge results in a saddle conformation, unusual for tetrasiloxane cycles, and in a significant strain of the cycle. The tetrasiloxane cycles linked by this bridge have a highly symmetric chair conformation which is likely to persist in the corresponding polymer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865330219
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular and crystal structure of 2,4,4,6,6,8,8-heptamethyl-2-[3-{[2,4,4,6,6-pentakis(dimethylamino)-2,2,4,4,6,6-hexa-hydro-1,3,5,2,4,6-triazatriphosphorine-2-yl]amino}propyl]-cyclotetrasiloxane (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 523 (1985), S. 14-20 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Molekular- und Kristallstruktur des 2,4,4,6,6,8,-Heptamethyl-2-[3-{[2,4,4,6,6-penta-kis (dimethylamino)-2,2,4,4,6,6-hexahydro-1,3,5,2,4,6-triazatriphosphorine-2-yl]-amino}propyl]cyclotetrasiloxansDie Molekular- und Kristallstruktur der Titelverbindung wurde bestimmt. Die (PN)3- und (SiO)4-Ringe bilden einen Diederwinkel von 100,1° und mit der HNCH2CH2CH2-Ebenen die winkel von 110,2° bzw. 75,7°. die molekulare Packung wird aus alternierenden Schichten von (PN)3- und (SiO)4-Heterocyclen aufgebaut.
    Notes: Molecular and crystal structure of the title compound has been determined. The (PN)3 and (SiO)4 rings form the dihedral angle of 100.1° and with the HNCH2CH2CH2 plane the angles of 110.2° and 75.7° respectively. The molecular packing is built of alternating layers of (PN)3 and (SiO)4 beterocycles.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855230403
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    Paper (German National Licenses)
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